.pw{
    width:800px;
    margin:0 auto;
}
h1{
    text-align: center;
    font-size:30px;
    margin:30px 0;
}
.container{
    width:800px;
}
.container>table{
    line-height:24px;

}
table{
    margin:0 auto;
}
table>tbody>tr{
    line-height:28px;
}
table>tbody>tr>td:nth-child(even){
    width:240px;
}
table>tfoot>tr>td{
    text-align: center;
}
table>tfoot>tr>td>input{
    width:100px;
    margin-top:15px;
}